318 crank machining

[MR4V]

Just got the crank linished at a machine shop and I have noticed that on the rear main seal they have linished off the knurling that returns any oil back in the engine.
Is knurling required as I would hate to have a leaking rear main.
Thanks

 

[Inertia]

It's not nec,, many makes of engines just have a smooth finish,, and for reverse rotation marine use,, they often just polish that knurl off..

hope it helps

 

[Bakerlite]

The knurl is used with the rope seal usually. Once you go to a neoprene type then the knurl can sometimes be a problem and cause leakage. If they have removed it completely then I would be checking that your new rear main seal in making correct contact with the reduced crank journal size , otherwise your going to have a leak..

 

[oliver]

Like everyone else said, it can be a good thing if they didnt take too much off. If your crank still has the knurling and you use a lip seal, you can expect to have a bit of seepage from the rear main seal when the engine is not running.

 

[MR4V]

Thanks. I will check the seal contact and use the neoprene one.